. >> one of governor romney's strong suits to you is the business side of you and he knows how to make money and our country needs to start making money. >> reporter: still, mitt romney has yet to win this businessman over. lopez wants specifics, which tax loopholes romney close? what will he do about immigration? >> you're holding out making a decision? >> yes, i'm still holding out, yes. >> reporter: that's why president obama was back in nevada today. both candidates are battling hard for this battleground state. >> romney for president? >> reporter: carpet bombing the air waves with the politicalads. >> my plan will create 12 million new jobs over the next four years. >> it is not just generating more jobs, you know, i'm going to create 1 more million jobs, tell me how, where. >> today it would be obama. tomorrow it could be romney. i can'ts promise anything. >> reporter: they both hope that the debates will help them finally make up their minds. bill whittaker, cbs news, las vegas. >>> 50,000 techis are invading san francisco today. they started today at the center. it is one of t